MOTOR GENERATOR CONTROL SYSTEM, Diagnostic DTC:P0A001C

DTC Code DTC Name
P0A001C Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    These DTCs indicate that the temperature sensor value is abnormal. The cause of this malfunction may be one of the following:

    Area Main Malfunction Description Step
    Inverter low-voltage circuit The connectors are not connected properly 2
    Hybrid cooling system Coolant circulation abnormal (frozen or leaking, etc.) 3
    Inside of inverter Inverter with converter assembly internal circuit malfunction 3

DESCRIPTION

The motor generator control ECU detects the HV coolant temperature using the HV coolant temperature sensor built into the inverter with converter assembly. The motor generator control ECU uses signals from the coolant temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the motor generator control ECU will limit inverter output to help prevent inverter overheating. The motor generator control ECU also detects malfunctions in the sensor based on the HV coolant temperature sensor values.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A001C Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range

The actual inverter coolant temperature is high and the difference between the estimated inverter coolant temperature and the actual temperature exceeds a threshold for 10 seconds, or after a long soak, the inverter coolant temperature sensor value differs from the values of other sensors.

(1 trip detection logic)

  • Inverter cooling system

  • Cooling fan system

  • Grille shutter system

  • Inverter with converter assembly

  • Wire harness or connector

 Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0A001C

  • Inverter Coolant Temperature

  • Ambient Temperature (Hybrid control system)

  • Inverter Water Pump Duty Ratio (Hybrid control system)

  • Inverter Water Pump Revolution (Hybrid control system)

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 5 hours or more.

    Note

    Make sure that the temperature of the motor and generator do not drop below -10°C (14°F).

  5. Turn the power switch on (IG) and within 3 seconds or less, turn the power switch on (READY) and wait 10 seconds or more.

    Tech Tips

    It is possible to turn the power switch on (READY) without turning it on (IG) first.

  6. Turn the GTS on.

  7. Drive the vehicle for approximately 10 minutes with the value of Data List item "Inverter Coolant Temperature" 25°C (77°F) or more.

  8. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.

  9. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for the Cooling System.

Click here

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P0A001C only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Table 1
      Malfunction Content Relevant DTC
      Insulation Malfunction P1C7C49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure
      P1C7D49 Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure
      P1C7E49 Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure
      P1C7F49 Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure
      Table 2
      Malfunction Content Relevant DTC
      Sensor and actuator circuit malfunction P0C7396 Motor Electronics Coolant Pump "A" Component Internal Failure
      P314A31 Motor Electronics Coolant Pump "A" No Signal
      System malfunction P0A9300 Inverter "A" Cooling System

      Tech Tips


      • P0A001C may be output as a result of the malfunctions indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. B004PEX

      Check the connection condition of the low voltage connectors of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and the connector for water and foreign matter.

      Tech Tips

      Click here

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the claws of the lock levers are engaged and that the connector cannot be pulled off.

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.

      Tech Tips

      When connecting the connector, connect it with the lock levers raised. Rotate each lock lever downward and make sure that the connector is securely connected. When a lock lever is fully lowered, a click will be heard as its claw engages. After the click is heard, pull up on the connector to confirm that it is securely connected.

      Result
      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. CHECK COOLING SYSTEM

    Click here

    Tech Tips

    If the "Cooling System" inspection results are normal, perform the next step.

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here